At House of Gassan, a former factory at Nieuwe Uilenburgerstraat 173-175 in Amsterdam, a guided visit introduces you to diamond cutting, polishing and grading. You can watch craftspeople at work and compare natural diamonds in different colours, including the Gassan 121 cut. The building pairs original brickwork with a modern reception and display spaces. After the tour, browse diamond jewellery and branded watches; the visit also includes a sales area, so you can take your time before deciding whether to buy.
Inside the former factory
House of Gassan is set in a former factory on Nieuwe Uilenburgerstraat. Its reception combines exposed red brick with contemporary fittings, keeping the building’s industrial character visible alongside the polished diamond displays. The site presents Amsterdam’s diamond-cutting tradition through its tour and working spaces.
The company’s family tradition in diamond craftsmanship dates to 1945. The tour gives visitors an introduction to the house’s history before moving on to the techniques used to cut and polish diamonds.
Diamond cutting and grading
During the guided visit, you can watch craftspeople working at diamond-cutting stations and learn how stones are assessed. Displays let you compare diamonds in different colours, including blue, yellow-green and white. The Gassan 121 cut is also explained as part of the tour.
The visit concludes in a jewellery sales area, where diamond pieces and branded watches are available to browse. Treat the buying portion as separate from the educational tour: you can look at the displays without making an immediate purchase. Coffee and water are available in the waiting area, with a cafe space at the back of the building.
Preguntas frecuentes
Is the House of Gassan tour free?
The guided tour is free.
How long does the tour take?
Plan for about 45 minutes to an hour.
What can you see on the tour?
You can watch diamond cutting and learn about polishing and grading, with displays of natural diamonds in different colours and cuts.
Can you buy jewellery at House of Gassan?
Yes. Diamond jewellery and branded watches are available to browse after the tour.
